An adjustable suspension cable method for testing bridge deflection
A bridge deflection and adjustable technology, applied in the direction of elasticity test, machine/structural component test, measurement device, etc., can solve the problems of inconvenient operation, cumbersome measurement system, etc. Easy-to-use effects
Inactive Publication Date: 2017-11-24
CHANGAN UNIV
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Problems solved by technology
[0011] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide an adjustable suspension method for testing bridge deflection, which is suitable for small spans and large spans, especially for overhead arch bridges, and solves the problems in the prior art. In the process of bridge deflection measurement, in order to ensure the measurement accuracy, the measurement system is bulky and the operation is inconvenient.
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Embodiment
[0044] This embodiment provides an adjustable suspension cable method for testing bridge deflection, such as Figure 1 to Figure 6 As shown, an arch bridge with a total length of 81m and a superstructure of 60m, the bridge deck width: net -7.0+2×1.25m (sidewalk and guardrail), and the substructure is a gravity abutment and enlarged foundation. The main cable 8 adopts 7*7=49 strands of steel wire twisted to form a steel wire rope with a diameter of 4mm. The method specifically includes the following steps:
[0045]Step 1, before measuring the deflection of the bridge 15, drive the first expansion bolt 2-1 of the ring type M8 model into the pre-determined position in the anti-collision wall 4, and install the sliding track 5 on the first expansion bolt 2-1, A column 6 is installed on the sliding track 5, and the column 6 and the sliding track 5 are locked by the lock nut 3, and the top of the column 6 is installed with a 6000U8*45*13 type first fixed pulley 7-1;
[0046] Step ...
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The invention provides an adjustable cable suspension method for testing the deflection of a bridge. In the method, a main cable is erected above the bridge anti-collision guardrails on both sides of the bridge, a pulley sports car is suspended on the main cable, and a horizontal cable is suspended on the pulley sports car. The bridge is horizontally placed on the beam below the bottom of the bridge girder, and a remote control winch machine that can make the beam vertically lift is installed on the beam; on the beam, according to the test requirements, multiple dial indicator racks can be installed, and the dial indicator is fixed on it. When measuring the deflection, adjust the remote control winch so that the measuring head of the dial indicator is on the bottom of the arch rib; a winch is installed on the anti-collision wall outside the bridge span, and the winch drives the pulley sports car to move on the main cable through the traction cable , so that the dial indicator reaches the target measuring point. The test loading vehicle passes the bridge deck, and the deflection data of the bridge is automatically obtained by the dial indicator and the data acquisition instrument.
Description
technical field [0001] The invention belongs to the field of road bridges and relates to the measurement of bridge deflection, in particular to an adjustable suspension cable method for testing bridge deflection. Background technique [0002] Bridge deflection is a very important data for bridge structures. It directly reflects the overall vertical stiffness of the bridge structure, and judges the weak parts of the bridge and the integrity of the structure. It is necessary to accurately measure the static and dynamic deflection values of the bridge. At present, there are many bridge deflection measurement methods at home and abroad, which are mainly divided into two categories, namely, full manual measurement method and automatic measurement method; the full manual measurement method includes mechanical measurement method and optical instrument measurement method, and mechanical measurement method is divided into two categories: 100% measurement method and hanging method,...
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IPC IPC(8): G01M5/00
Inventor 王晓明杨纪鹏杨辉东孙天杨国俊乔星昇段玮
Owner CHANGAN UNIV